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From:   Marc Zyngier <maz@kernel.org>
To:     linux-kernel@vger.kernel.org
Cc:     Linus Walleij <linus.walleij@linaro.org>,
        Bartosz Golaszewski <brgl@bgdev.pl>,
        Thierry Reding <thierry.reding@gmail.com>,
        Joey Gouly <joey.gouly@arm.com>,
        Jonathan Hunter <jonathanh@nvidia.com>,
        Hector Martin <marcan@marcan.st>,
        Sven Peter <sven@svenpeter.dev>,
        Alyssa Rosenzweig <alyssa@rosenzweig.io>,
        Bjorn Andersson <bjorn.andersson@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Basavaraj Natikar <Basavaraj.Natikar@amd.com>,
        Shyam Sundar S K <Shyam-sundar.S-k@amd.com>,
        Andy Shevchenko <andy.shevchenko@gmail.com>,
        linux-gpio@vger.kernel.org, linux-tegra@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-arm-msm@vger.kernel.org, kernel-team@android.com
Subject: [PATCH v3 03/10] gpio: Add helpers to ease the transition towards immutable irq_chip
Date:   Tue, 19 Apr 2022 15:18:39 +0100
Message-Id: <20220419141846.598305-4-maz@kernel.org>
In-Reply-To: <20220419141846.598305-1-maz@kernel.org>
References: <20220419141846.598305-1-maz@kernel.org>
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Add a couple of new helpers to make it slightly simpler to convert
drivers to immutable irq_chip structures:

- GPIOCHIP_IRQ_RESOURCE_HELPERS populates the irq_chip structure
  with the resource management callbacks

- gpio_irq_chip_set_chip() populates the gpio_irq_chip.chip
  structure, avoiding the proliferation of ugly casts

Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Marc Zyngier <maz@kernel.org>
---
 include/linux/gpio/driver.h | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/include/linux/gpio/driver.h b/include/linux/gpio/driver.h
index 066bcfdf878d..832990099097 100644
--- a/include/linux/gpio/driver.h
+++ b/include/linux/gpio/driver.h
@@ -583,6 +583,18 @@ void gpiochip_enable_irq(struct gpio_chip *gc, unsigned int offset);
 int gpiochip_irq_reqres(struct irq_data *data);
 void gpiochip_irq_relres(struct irq_data *data);
 
+/* Paste this in your irq_chip structure  */
+#define	GPIOCHIP_IRQ_RESOURCE_HELPERS					\
+		.irq_request_resources  = gpiochip_irq_reqres,		\
+		.irq_release_resources  = gpiochip_irq_relres
+
+static inline void gpio_irq_chip_set_chip(struct gpio_irq_chip *girq,
+					  const struct irq_chip *chip)
+{
+	/* Yes, dropping const is ugly, but it isn't like we have a choice */
+	girq->chip = (struct irq_chip *)chip;
+}
+
 /* Line status inquiry for drivers */
 bool gpiochip_line_is_open_drain(struct gpio_chip *gc, unsigned int offset);
 bool gpiochip_line_is_open_source(struct gpio_chip *gc, unsigned int offset);
-- 
2.34.1